NOTICE: If this gets patched I'll make sure to update the guide and put a notice in the title on YouTube.
A guide showing you which drills are best to help you get the achievement.
As of launch, the description says Tier 3 Weapon Drills but this is not the case, it may get patched later so best off doing it now!As I explain in the video, you may find some challenges easier than others because you may prefer different weapons to others, everyone is different.
The Tier 1 challenges are the easiest of each weapon as the enemies do not move, but I found all the M41 SPNKR all easy for me. If you're struggling, remember there are other challnges and you may find them easier. Also maybe changing your sensitivity might help.
Good luck Spartans!